Impregnating process.



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' To all whom it may concern."

' Be it hown that T, ARTHUR l1. BROW a citizen of the United States, anda reeldent of Wilkinsburg, in the countyof Allegheny and State ofPennsylvapia, have in- "vented a new and useful lmprovement inlimpregnating Processes, of which the following is a specification. 1

My invention relates to processes of impregnating cloth and otherabsorbent material, aildit has special reference to processes ofimpregnating such materials with varnish in order to render themwaterproof and suitable for electrical insulating purposes. i

- The object of my invention is to provlde :an impregnatingprocess ofthe above indicated character by means of which absorbent materials maybe impregnated. quickly and easily, and by which a saving in materials Iand expense may be efiected over the processes heretofore employed.

'Cloth, paper and similar material is usually impre ated with varnish byiman mersing the fa ric in a bath composed of a drying oil and a varnishgum, boiled linseed oil and gum copal being commonly employed for thispurpose. The varnish is thinned to the roper consistency for applicationto the abric with benzin or other suitable solvent. After one or moreapplications of the varnish, the fabric is baked, and the solvent isthereby evaporated and i lost.

llb

the fabric first with the drier and then with a separate application ofthe raw d oil; on T may first apply the drying l dg the fabric andafterward a ply the drier. At present, however, ll pre or to treat thecloth first with the drier and then with the oil. The drier absorbedby-the cloth appears to eect sufiicient polymerization of the oil in thepresence of air, to coating i Specification of Letters Patent.

D MMUFACTUJBING COMPANY, A COOEATION 01E PENNSYLVANIA.

IMPREGNATING PROCESS.

- to the varnish coating produced by present methods.

Patented Wee. d, lfijl'f.

Application filed December 10, 19M. Serial No. crease.

Anysuitable manipulations may be employed for subjecting the cloth orother fabric to successive applications of the drier and the oil. Forexample, a Web of'clbth may be run through a bath of drier and thenthrough one or more baths of the oil, and these operations may becarried out in an of the well. known impregnating machines. Thetemperature at which the operations are performed, and the length oftime during which the material is immersed in the successive treatingbaths, do not dider materially from the ordinary conditions offabricimpregnation and may readily be controlled by operatives havingordinary skill. After the fabric is treated in the manner describedabove, it is subjected to the action of dry heat by balring'it in theusual manner.

The particular substances mentioned above are referred to only for thepurpose of illustration, and I do not wish to be restricted to theiruse. In the subjoined claims, therefore, the expressions polymerizingagent and polymerizable substance are to be understood as referring toevery kind of drier and every kind of drying oil which are available foruse in the arts. It is also to be understood that the claims which specithat the drying oil and drier are applie successively? are intended to,cover the modification of my process inwhich the drier and oil areapplied in the order named and also the modification in which the oil isapplied first and the drier afterward. In

new of the numerous modifications which y be efi'ected in my process,within the scope of my invention, desire that only suchlimitations shallbe imposed upon my invention as. are indicated in the appended claims.

ll claim as my invention I. A .process of impregnating absorbentmaterial that comprises successively applying to the said material 'apolymerizable liquid and a polymerizing agent.

2. A prmess of impregnating absorbent material that comprises applying apolymerizing agent to the said material and then applyinga.polymerizable liquid to the said material.

3. A process of impregnating absorbent material that comprisessuccessively applylib int

through a bath of a drying oil.

ing to the said material a drying oil and a drier.

4. A process of impregnating absorbent material that comprises applymg adrier -to the said material and then applying adrying oil to the saidmaterial.

5. A process of impregnating absorbent material that comprisessuccessively applying to the said material a raw drying oil and'a drier.

6. A process of impregnating absorbent material that comprises applyinga drier t0 9. A process-of impregnating cloth that comprises passing thecloth through successive .baths of raw linseed oil and a drier.

10. A process of impregnating cloth that comprises passing the cloththrough a bath sive baths of raw linseed oil and a drier,

and then applying dry heat to the treated cloth.

1:2. A process of impregnating cloth that comprises passing the cloththrough a bath of a drier, then passing the cloth through a bath of rawlinseed oil, and finally applying dry heat to the treated cloth.

13. A process of impregnating cloth that comprises passing the cloththrough a bath of a drier, then passing the cloth through a plurality ofbaths of a drying oil, and finally subjecting the treated cloth to dryheat.

In testimony whereof I have hereunto subscribed my name this 28th day ofNov.,

ARTHUR L. BROWN.

Witnesses: Q

B. B. HINEs, M. C. MnRz.

